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Chevy Silverado and GMC Sierra Electrical and Computer Questions



  • gmcustsvcgmcustsvc Posts: 4,251

    I am happy the dealership has taken care of you and has found the problem! If you have any questions or concerns please feel free to contact me directly.

    Thank you,
    Caron, GM Customer Service
  • I have a 2000 Chevy Z71 - Alittle history first- the AC compressor has been going out so AC only works partial - it is turned off and on a lot. Battery went out 2 weeks ago and it was replaced. That being said- got in truck 2 days after I replaced the battery and the truck "flipped out". The 4WD light panel started blinking and now does not light up at all. AC getting no power, the gas gauge not working and the light indicator (P R N D panel ) not lighting up, temp gauge not working. Battery warning light stays on. Radio is working, dash backlighting is on, battery volt gauge works and oil gauge works. Speedometer/RPMS gauge works.
    I have done a system check - battery, alternator, and starter no problems - returns no codes. All fuses have been checked. Volt regulator checked. Any suggestions????
  • The other day my wife and I took are dog to the vet it was raining here pretty bad, it was raining all day we were in the vet for about a half hour after the vet we were on our way back to the truck I had started it with the remote start no problem. We got in the truck started backing out of the vet's the door locks started to unlock and lock I thought the dog was hitting the door button, I asked my wife if the dog is touching the button and she told me no. As we started driving home the dash board lights, traction control off came on and I never touched it. We continued home the door locks started going on and off headlights flashing dash board going crazy flashing on and off truck beeping, so I pulled over and checked to see if somthing was loose I could not find anything, so we continued home every time we started to pick up speed it would start doing it again. We got home and got it in the driveway turned it off tried to set the alarm and there was no power at all, I got back in and tried to start it and nothing no power I pushed the brake pedel put it in drive and the power came back on. It has not happened for a few days now does anybody know what causes this problem
  • 08chevy07gmc08chevy07gmc Posts: 1
    edited September 2011
    I started experiencing the same problems posted by savvy5000 this weekend while driving in the Texas hill country. The first indication of a problem was stabilitrack needs servicing. Then when appling the brake or using the turn signal, the radio and a/c powered down and eventually turned off. The door locks started cycling, the truck downed shifted and started hesitating at highway speeds. The truck stabilized when I stopped and put it in park. Did not want to turn it off since I was in the middle of nowhere and was afraid it would not start. I started again for home but when I used the turn signal again, the problems returned. It is now at my local dealer and they want to replace the battery cables becuase of high resistance. $600 and I'm afraid that will only be the beginning. Since reading this forum, I wonder if anyone with a truck out of warranty (68K) has had any price adjustment from GM? I'm sure they have a service bulletin on these type of problems.
  • gmcustsvcgmcustsvc Posts: 4,251

    Were you planning on taking the vehicle into your local GM dealership to be looked at? Please keep me posted.

    Thank you,
    Caron, GM Customer Service
  • gmcustsvcgmcustsvc Posts: 4,251
    I apologize for your concerns. Can you please email me with your VIN and contact information as well as a description of your experience? I look forward to speaking with you.
    GM Customer Service
  • I took it to my local dealership today and they told my that they wanted to replace the battery wires, and told me cause it's past my warranty that I would have to pay full price of $500 plus tax.The first time something happened and go figure my warranty is up. Wow I just think that's a little to much money to let the dealer to charge I think might just change them myself for less then half the price.

  • i had same coincided with fuel pump replacement.after taking it to a shop ,where they replaced a bunch of sensors,relays,etc etc [all fuel related and electrical] then the problem still existed so they put all my old [and working] parts back bil went from a100.00 when they started to 600 after 3 days and a dozen replacements ...then back to 200 when they put all my old parts back.FINALLY a mobile mechanic happened to come by ,and after 15 minutes he found problem...a loose wire connection from fuel pump wiring to the power source for it....5 days later it was solved.....all over a loose wire connection..IT was a relief because id be driving along fine and then a warning light on dash would appear saying loss of engine power .. my max speed would be 10-15 mph ..sometimes id get lucky by loosening fuel filter and releasing pressure,or removing positive cable overnight to reset computer ...etc etc tried a bunch of things but ...check wiring from fuel pump on top of tank .you can loosen bolts and dropit a few inches for access
  • sierraredsierrared Richmond, VAPosts: 5
    I have a 2004 Sierra SLT 4WD with 70,000 miles. Bought new. Had to replace driver side auto dim heated outside mirror for $600. Somehow it got chipped and was leaking heating oil. At same time, replaced original battery at dealer. Another $170. Just got it home and noticed the snowflake light switch on the automatic heat/air unit doesn't light anymore. Other buttons are lit: Off, Recirc, Defrost, DeFog. If I tap it, the Defrost light next to it flickers but stays on. The AC snowflake light still doesn't come on. Is this something simple to fix, like a light bulb. I still love the truck, but would like to have the light panel working as intended. Can you advise me on this, someone?
  • My cruise recently quit working. The orange light on the steering wheel still comes on, but the green one on the dash will not. Wondering if it's just a problem with the button, or something more serious?

    Anyone got any advice?
  • Hi, I have a 2007 Silverado 1500 LT, I have haveing ALL the SAME issues you have described. I have my truck at the dealership and they are having problems diagnoising it. Since this only happens intermittently they have not "experienced" the problem. Have you had any luck with figuring the problem out.
  • I have a 2008 GMC Sierra K2500 with the Duramax egine and I got in turn key it fired right up put it in drive and it died, put it in park turned key off then tried to start again but it would not fire up. Fuel level was fine no air in line, no kill switch etc. Had it towed to GM garage and the next day it started and ran all day no problem no codes popped up GM found nothing wrong. 5 days later got in turned key it acted as if my battery was dead and barely turned over, turned key back to off then turned to start it again and it fired right up no issues, but as I am driving I notice the AC display shows that I have both driver and passenger on and set to head & feet on 74 but I had left it as head only and 60. So I adjusted it but the driver side continued to blow only heat but passenger was blowing cold. tried several things with no result. drove to lunch same thing with ac but it started fine. got in at end of work day and it worked fine. I have 50K miles on the truck and batteries are fully charged and no corrosion on terminals. No lights on info center ever popped up.
  • i have 2003 chevy silverodo .i am also having the exact same problem please tell me how you resovled this.
  • gmcustsvcgmcustsvc Posts: 4,251

    I apologize for the problems you are experiencing. Could you please email Christina your VIN and current mileage? Also, please p
    rovide a description of the problems you are experiencing.

    Thank you,
    Caron, GM Customer Service
  • Did you ever find out anything on this issue? I have the exact same problem, and my vehicle downshifted from drive to a lower gear. I was only doing 30, but still a wake up call!
  • I am having the identical issue as several other Edmunds users with my 2003 Silverado. The "Service 4WD, Service Brake System," the ABS light and Brake light on the display illuminate, and the heat shuts off. My vehicle down shifted into low by itself and almost got me killed in traffic by being rear ended by a semi. I’ve seen on Edmunds several ineffective attempts to resolve the issue, and would like to know if there is a definitive fix. Any assistance you may be able to provide would be most appreciated.

    Glenn Hoilman
  • hammiehammie Posts: 1
    Same issue here. I pulled the fuse and heard the system click off then back on, not sure if it helped yet. Did you learn anything about this yet?
  • I have been having the same problem with my heating system, lights going out, engine stalling etc. I have been researching and I found this forum 00-big-problems-29498/page3/

    I have not tried yet but I will tonight. I will re post when I figure out the problem.
  • I see that you’re already on your way to addressing your heating concern. If Customer Assistance can be of any service to you, even by looking into any recall information for you, please email us with your name and last 8 digits of your VIN.

    GM Customer Service
  • I had 2 separate problems. The 1st was the 4WD motor/encoder, or the wiring for it. The wire support broke & the wires rubbed through on the driveshaft universal collar. Fix the wires, & changed the fuse. Good to go there. The second was the EBCM ground connection to the frame. There was bad grounds, (corroded) which was faulting out the whole ABS system. Disconnected them and cleaned both the frame spot and lugs. Rebolted them and got a friend to reset the codes with his GM scan tool and all is well with the world. I did also find my positive battery terminal crudded up. I was only reading 12.9 vdc with the truck running. I pulled the battery, and cleaned it and the cable. Now reading 14.1 vdc with the truck running. Who would have thought! :)
  • my dash gauges do not work, then they do, then they don't, ect... when they are trying to work, the noise sounds like a computer booting up and shutting off. i have no speedo, nor RPM, NOTHING WORKS. refuse to take it to a garage, any solutions dear people?
  • I'm sorry to hear about these issues - I understand from your post that you aren't interested in taking it to a dealership . If in the future you do decide to work with one of our dealers, we're here to assist in the process.

    GM Customer Service
  • wvgmcwvgmc Posts: 1
    I need help with my trucks electrical. I have a 2001 GMC Sierra 3500 Duramax with 129,xxx miles. The rear running lights are no longer functioning. The truck is a cab and chassis. The best I can tell is the factory wiring runs to the rear of the truck and the bed manufacturer did the wiring on the bed using the standard trailer 7 way colored wire. I spliced into the aftermarket wiring directly after it connects to the factory wiring. There is no power from the factory running light wire. All the other wires have power and they too are inside the factory shielding. Any suggestions about how to fix the problem? Is there a fuse for front and rear? Is there an inline fuse? Can I tap into the running lights somewhere else on the truck safely? Any help would be appreciated.
  • wstgawstga Posts: 11
    I purchased a used 2007 Chevy Silverado 5.3. This truck was a GM certified truck. Within about 3 months of owning this truck we started having terrible electrical issues that effected all systems including the brakes and transmission.

    In good faith, I took my truck to my local GM service center. Because this issue is random , it can't be duplicated on demand. Sometimes this truck will run 30 days without issue; you just never know. Because this issue is random , the dealer never could see the problem.

    This electrical issue doesn't store a error code. The battery cables are clean and never get hot. All of my ground wires have been inspected. I paid $400 bucks to have the mega fuse replaced. This issue is still not resolved.

    I was advised by my local GM service center to start recording this on video so the tech's could see what was going on. I was able to record 6 cases where this occured. I presented this to the service center and they were amazed. My truck stayed another week and returned to me without finding the problem.

    Weeks passed and the problems occured again. Loss of brakes , door locks locking and unlocking , RPM gauge and Speedo going back and forth. I called the dealer when this occuring and they advised me to bring this in. I never could make it. I lost control and had to have this truck picked up by dealer.

    For almost 3 weeks my truck stayed in the shop. They said they drove it. They said they needed more money to do advanced testing. Then they said they didn't want to test. I picked up my truck. Thankful for that I see the other cases where GM is having serious safety issues.

    This is where I really get disappointed with GM. My service center didn't suggest to call GM corporate. I had to find this out here on Edmunds. When I explained my concerns to GM rep, I was given such a run around. I offered to send them my video's to help show my problem. They refused and said it wouldn't help. I have been researching this far more than my local shop has. I offered them blog after blog from other Edmund posts with the same problem. "No sir , we cannot take any packages by mail or email" I was offered $2000.00 bonus on a trade for a new truck for my problems. Again I am begging for help from somebody to at least look at these videos. Am I asking too much from GM? I just want somebody to personally get involved and look at what I've got. It is amazing to me that these reps on the phone will not give you their last name , will not give you any mailing addresses , will not give you their supervisors names and will not refer you to anybody else. I felt like I had to beg for my case number. I hit a stone wall.

    I finally was kicked to the curb and told they'd call me if there ever had a recall. I was told by a GM employee later "your issue will not get any technical review or futher review unless there is a accident" So now , I am stuck with a GM product , that doesn't qualify for lemon law in my state. I am stuck with a potential accident waiting to happen. This truck is what my wife and child drive to school in. All I want is some help and not to be treated like another number.

    I will soon be adding my video online with hopes others might get some help.

    I really hope this isn't how customers with safety concerns are treated all the time. I want GM to succeed.
  • Hey wstga, when I was having these problems I finally narrowed it down to the incoming hot-wire connector in the fuse panel under the hood. My 08 has a removable fuse panel and under the fuse panel are some connectors and a singal spade connector as shown in the pictures. I took the spade connector out and squeezed the metal contacts together so they would make better contact with the bottom of the fuse panel and I have not had any problems since.
    This pictures is the connectors under the fuses
    This Picture shows the hot-wire connector close up. I have pointed to the metal contacts that I squeezed together to make a tighter fit. The whole connector unsnaps from the base and then you can take of the white piece which I call the keeper and the wire and connector will slide out then use a pair of pliers to squeeze it together.

    I hope this helps as it did for me so good luck. Just make sure you disconnect the positive battery wire before attempting this fix.
  • wstgawstga Posts: 11
    Thank you so much for your help. I'm posting my video's next , if they look familiar let me know. Thanks !!!
  • wstgawstga Posts: 11
    edited December 2011
    This clip I posted sounds so much like what a lot of people are having problems with. Copy link and check it out. Looking for feedback from anybody elas that has had this problem fixed.
  • wstgawstga Posts: 11
    Sounds like I have the same exact problem. Has it been resolved. I've had a terrible time dealing with GM on getting this right.
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